Safety shield



Feb. 2, 1937. H. E. TAUTZ SAFETY SHIELD Filed 00 21 1935 2 SheetsSheet 1 FIG.'1

3' INVENTOR NES ES .WMI

H. E. TAUTZ Feb. 2, 1937.

SAFETY SHIELD Filed Oct. 21,

1935 2 Sheets-Sheet 2 Patented Feb. 2, 1937 UNITED 's ATEs SAFETY sn ELn Herbert E. Tautz, Milwaukee, Wis., assignor to The Delta Manufacturing Company, Milwau-- kee, Wis., a corporation of Wisconsin Application October 21, 1935, Serial No. 45,933

10 Claims.

The invention relates to safety shields for grinding wheels and the like, and has for an object to provide a safety shield which will effectively guard a user of a grinding wheel from flying particles and afford shadowless illumination of the wheel and work viewed through the shield.

Another object of the invention is to provide a safety shield which can be easily assembled, and which can be rigidlymounted to avoid vibration.

A further object is to provide simple but effective means for mounting and replacing a transparent panel for the safety shield.

The invention further consists in the several features hereinafter described and claimed.

In the accompanying drawings, illustrating one embodiment of the invention,

Fig. 1 is a front elevation of a grinder with safety shields constructed in accordance with the invention, one of the shields being shown in section,

Fig. 2 is an end elev'ationof the grinder,

Fig. 3 is a top plan view of one end of the grinder and its shield,

Fig. 4 is a bottom plan view of one of the safety shields, parts being broken away and parts being shown in section,

Fig. 5 is a sectional elevation of the safety shield taken on the line 5 '5' of Fig. 3,

Fig. 6 is another sectional view of the shield taken on the line 6-6 of Fig. 3,

Fig. 7 is a detail bottom view of a portion of the shield, parts being removed and parts being shown in section,

Fig. 8 is a sectionalview taken of Fig. 6, and

Fig. 9 is an end view of a reflector for the shield.

In these drawings, l5 designates each of a pair ofgrinding wheels which are detachably mounted on the opposite ends of a horizontal shaft l6. By way of illustration, the shaft It forms the rotor shaft of an electric motor I! which is mounted on a suitable base Hi.

The grinding wheels l5 are enclosed in respecon the line 3-3 tive guards or housings l9 rigidly secured to the jecting discharge nozzle or dust chute 20 at its lower portion. An apertured lug 20' is also provided on each wheel housing to support a water container, not shown. The outer side of each wheel housing is formed by a plate 2| detachably secured thereto by screws 22 so as to permit mounting and removal of the grinding wheel.

At the motor side each housing is provided with horizontally extending ways 23 receiving a slidable bar 24 adjustably clamped thereto by a screw 25. A vertically slotted bar 26 is adjustably secured by a screw'21 to the front end of the bar 24, and a tool-supporting plate '28 is adjustably se- 5 cured to the upper end of the bar 26 by a screw 23, the plate being notched to loosely fit over the edge of the grinding wheel.

An arcuate spark guard plate 30 is adjustably secured to an arcuate seat 3| on the upper portion 10 of the wheel housing by a screw 32 passing through a slot 32' in the plate, and has a notched lower edge loosely fitting over the edge of the grinding wheel.

At its upper portion, each wheel housing l9 has 16 a flat-faced boss 33 to which is secured an upstanding stud 34. A support or housing 35 with a skirt has its rear portion seated on the boss 33 and clamped thereto by a cap nut 36 on the stud 34, the stud passing through a. bore 31 in the shield 20 housing. In many instances, the shield housing may bedie cast. By way of illustration, the shield housing has a substantially rectangular body portion 38 with rounded corners and a sloping top wall, the'body portion being provided with a hol- 25 low rear extension 39 which projects downwardly therefrom and is seated on the boss 33 of the wheel housing 19, the upper wall of the extension having the bore 31 for the stud 34. The extension 39 has preferably formed therein a transverse 30 reenforcing rib or web 40', and the rear edge of the extension has formed therein a downwardly opening notch 4|.

Extending between the opposite side walls of the Y body portion 33 is a vertical partition wall 42 35 which is spaced from the rear wall of the body portion and is connected therewith by vertical reenforcing ribs or webs 43, the lower edges of the webs being spaced above the bottom edge of the body portion to form a wiring channel or conduit. 0

Extending between the front wall of the shield housing and the partition wall 42 are a pair of spaced parallel vertical partition walls 44 which form lamp compartments with the opposite side walls of the shield housing. Ventilating openings 45 45 are formed in the sloping top wall of the shield housing to communicate with the lamp compartments.

Between the partition walls 4, the sloping top wall of the shield housing has a rectangular opening 46. therein which is closed by a transparent panel 41, preferably formed of shatter-proof or safety glass. The glass panel rests against the lower surface fofthe housing top wall and fits between the partition walls 44 at the sides and between projections 48 on the partition wall 42 at the rear and lugs 49 on the front portion of the 7 housing. The glass panel is releasably secured in position by bowed resilient metal straps or bars 50 at opposite sides, the rear ends of the bars resting in pockets. 5| in the projections 48, and the front portions of the bars being upwardly offset and passing through apertures 52 formed in the front wall of the shield housing, the offset portions of the bars forming shoulders 53 which look thebars in place, as seen in Fig. 5. The bars are installed by pushing them through the apertures 52 and entering their rear ends into the pockets 5|, the shouldered front ends of the bars snapping into place. If a glass panel should require replacement, the bars are readily removed after lifting their shouldered front ends, so as to pass through the apertures 52.

Lamp sockets 54 are mounted in the lamp compartments formed at the opposite sides of the I shield housing and each carries an electric lamp 55. The lamp sockets are preferably of the bayonet type to avoid accidental loosening of the lamps by jarring. Each lamp socket comprises a barrel 56 of molded insulating material having integrally formed thereon a vertical flange or plate 51 which is slightly narrower than the width of the lamp compartment. The partition 42 of the shield housing has a downwardly opening notch 58 at each lamp compartment to receive The vertical the barrel of the lamp socket. socket plate or flange 51 fits loosely between the partition 42 and a forwardly spaced web or partition 59 connecting the side wall of the shield housing with the partition 44, the partitions 42 and 59 forming a pocket between them. The upper end of the socket plate or flange is rounded and abuts against the lower edge of a stopforming web 60 connecting the partitions 42 and 59. A reflector SI of resilient sheet metal is placed above the lamp and has the shape of an inverted trough. The rear end of the reflector has a central notch 62 (Fig. 7) and out-turned ears 63 which hook behind the partition 59, the notch facilitating ventilation and the springing of the rear portions of the reflector. Preferably, the opposite side edges of the reflector also bear against vertical ribs 54 formed on the side wall of the housing and on the partition 44. The lamp socket plate 51 is provided with lugs 65 near opposite sides edges engageable with the lower edges of the reflector, so as to hold the reflector in place.

The two lamp sockets have conductors or leads 66 which are connected to conductors 67 of an armored cable 68 to form a wiring harness. The lamp sockets and conductors in the shield housing are held and enclosed therein by a sheet metal bottom plate 69 havingedges fitting in rabbets 10 in the lower edges of the housing and secured in place by screws .H threaded into projections 12 formed in the topwall of the housing, the plate 69 having a curved rear end to meet the wheel housing boss 33. The opposite end portions of the bottom plate support the lamp sockets, the lower edges of the socket plates or flanges 51 resting on the bottom plate.

The-opposite ends of the armor sheath of the cable 68 have molded thereon peripherally grooved soft rubber bushings i3 and 14, the former of which is entered into the notch 4| in the rear extension of the shield housing and has a flat lower face 13 to engage the boss 33. When the shield housing is secured to this boss the cable is also secured in position and the wiring is completely enclosed.

The cable bushing 14 is entered into an aperture in the motor base [8, and the cable leads are extended to a switch 15 mounted on the front portion of the base. Preferably, the same switch controls the motor i i. The mains are connected to the grinder base by a suitable cable 16. The two lamps are here indicated to be connected in parallel but they may readily be connected in series, if desired, permitting the use of 110 volt lamps on 220 volt mains.

In assembling the safety shield, the shield housing is preferably placed'in inverted position. The wiring assembly or harness complete with sockets is then inserted into the shield housing, the sockets being entered into their compartments or pockets, and the cable bushing '13 being entered into the notch 4| of the shield housing extension 39. The bottom plate 69 is then fitted in place and secured by the screws II. The glass panel 41 is applied and secured in place by the resilient bars 50. The assembled safety shield is then mounted on the grinder and the cable 68 is attached to the motor base and connected to the switch 15, the resilient shouldered cable bushing 14 being pushed into an aperture in the motor base.

In use, the operator views the wheel and work through the sloping glass panel 47 which is located centrally above the front portion of the grinding wheel, the pzinelguarding the operator from flying sparks or other particles. The lamps at opposite sides of the safety shield are located substantially equal distances from the central plane of the wheel and flood the edge and opposite side faces of the wheel with light, so as to avoid shadows on the work, whether the work is applied to the edge of the wheel or to either side face of the wheel, thus facilitating accurate grinding. The positioning of the lamps at opposite sides of the panel also minimizes glaring reflections through the panel, and insures adequate lighting of the front portion of the wheel. The fanning action of the wheel draws air downwardly through the openings 45 in the top wall of the shield to ventilate the lamp compartments.

The curved shape of the spark guard plate 30 minimizes obstruction to vision and permits adjustment of the guard without interfering with the shield housing.

While the safety shield is here shown to be applied to a grinder it may also be applied to other machines or devices.

What I claim as new and desire to secure by Letters Patent is:

1. A safety shield comprising a housing having a.- partition extending between opposite sides thereof and spaced from a wall of the housing to form a wiring space, a transparent panel carried by said housing for viewing work therethrough; lamp sockets carried in said housing at opposite sides of said panel to receive lamps for illuminating the work, and a plate detachably secured to said housing to hold said sockets therein and to enclose said wiring space.

2. ,A safety shield comprising a housing having a body portion and a hollow mounting extension provided with a notch, a. transparent panel carried by said body portion for viewing the work therethrough, lamp sockets detachably carried in said body portion at opposite sides of said panel to receive lamps for illuminating the work, a wiring harness connected to said sockets and insertable into said housing and said notch, and means for enclosing said wiring harness in said housing.

3. A safety shield comprising a support having an opening, a transparent panel for said opening, and means for holding said panel including a resilient bar'pressing said panel against said support and detachably engageable at opposite end portions with said support, said bar having a locking shoulder adjacent one end engageable with said support to resist longitudinal displacement of the bar.

4. A safety shield comprising a support having an opening, a transparent panel for said opening,

and means for holding said panel including a resilient bar pressing said panel against said support and detachably engageable at opposite end portions with said support, said support having an aperture to receive said bar endwise therethrough, and said bar having a locking shoulder engageable with said support adjacent said aperture to resist longitudinal displacement of the bar.

5. A safety shield'comprising a support having an opening, a transparent panel for said opening, and means for holding said panel including a resilient bowed bar pressing said panel against said support, said support having an aperture to receive said bar endwise therethrough and having a pocket to receive an end portion of said bar, the other end portion of said bar having a locking shoulder engageable with said support adjacentsaid aperture to resist longitudinal displacement of the bar.

6. A safety shield comprising a housing having a top wall and a skirt, said top wall having an opening, a transparent panel for said opening for viewing work therethrough, and means carried by said housing for directing light onto the work from regions adjacent the opposite sides of said panel and within said skirt.

7. A safety shield comprising a support having opposite side walls and partitions spaced from said side walls to form lamp compartments, a transparent panel carried by said support at the middle portion thereof for viewing work therethrough, and lamps in said compartments for illuminating the work.

8. A safety shield comprising a support, a transparent panel carried by said support for viewing work therethrough, said support having pockets adjacent opposite sides, lamp sockets carried by said support at opposite sides of said panel to receive lamps for illuminating the work, each socket having a flanged portion insertable into the respective pocket of the support, and means for holding said sockets in said pockets;

9. A safety shield comprising a housing having a top wall and opposite side walls and having partitions spaced from said side walls to form lamp compartments, said top wall having openings for ventilating the lamp compartments, a transparent panel carried by said housing between said compartments for viewing work therethrough, and lamps in said compartments for illuminating the work.

10. A safety shield comprising a housing, a transparent panel carried by said housing for viewing work therethrough, pockets in said housing adjacent opposite sides thereof, lamp sockets insertable into said pockets, reflectors engageable in said pockets and secured by said sockets, and lamps in said sockets for illuminating the work.

HERBERT E. TAUI'Z. 

